A brutal September for bonds points to an even darker October

A stabilization or reversal in bond weakness would likely reflect either a shift in Fed expectations toward rate cuts, a decline in inflation signals, or a flight-to-safety bid that supports prices—each of which could ease pressure on equity valuations and borrowing costs.

Continued sideways pressure on bonds without escalation would suggest markets are digesting higher-for-longer rate expectations without panic, allowing equities and credit spreads to stabilize at new levels despite elevated yields.

A sustained or accelerating bond selloff into October would put downward pressure on equity multiples, widen credit spreads, and increase refinancing costs for corporations and households, with particular stress on duration-sensitive sectors like utilities and REITs.